download cpuz, and recheck your ram settings and post them here.
Did you save your bios settings?
did you get an error msg after you changed bios? saying something like : "overclocking failed"? (if this is the case, try increasing the voltages to your ram)
If none of the above works try changing your fsb. which should be on 166mhz, or? If you got a decent cpufan increase it to 200mhz (this will overclock your cpu aswell)